please answer these questions

$1)$The innovation process can be divided into four main stages. Explain each of the stages and give your opinion on which of those stages may be the most challenging to complete for an organization.

$2)$We reviewed the six most common sources of innovation and the three most common ways of classifying types of innovation. Choose two of these sources and find examples of innovations that were introduced by those sources. Then, for each of the two innovations, use the common types of innovation to classify these innovations. Explain your selections and reasoning clearly.